CERN Community ENTerprise Operating System 7 is the upstream CentOS 7, built to integrate into the CERN computing environment but it is not a site-specific product: all CERN site customizations are optional and can be deactivated for external users.

CERN Community ENTerprise Operating System 7 is the upstream CentOS 7, built to integrate into the CERN computing environment but it is not a site-specific product: all CERN site customizations are optional and can be deactivated for external users.

The breakup was already discussed here.And yes, it is sorry to see that CERN will be going its own way starting with EL7

As for Red Hat, I think they try to prevent Oracle to take any of their money with their clone.CentOS was a serious clone regarding the userbase, that made it logical to include them.Red Hat is little worried by "little" clones like SL and Puias. But we will see what will happen ...

On January 7, Red Hat and CentOS announced that they joined forces (centos.org).

Since Scientific Linux relies on Red Hat Enterprise Linux source code, this is of great interest to the Scientific Linux project. We have been learning more about their plans and considering the possibilities for Scientific Linux.

We've had conversations with CentOS and Red Hat, and between Fermilab and CERN. We plan further discussions with these groups and also with other contributors to and users of Scientific Linux. No final decisions have been made, but we can provide an update on our thoughts so far.

Fermilab and CERN remain committed to the original goal of Scientific Linux: providing a stable, well-supported, open-source platform which meets the needs of high-energy physics experiments. The fact that this platform is used by people outside of that community is something we appreciate and will be a factor in any decisions going forward.

There are still many questions to pursue as the details of CentOS Special Interest Groups continue to evolve. The anticipated release of Red Hat Enterprise Linux 7 presents an opportunity to consider forming/joining a CentOS Special Interest Group (centos.org/about/governance/sigs/) and producing Scientific Linux 7 as a CentOS variant (centos.org/variants/). The variant structure may allow greater flexibility in adapting the distribution to scientific needs. The framework and relationship structure of CentOS Special Interest Groups is still under heavy discussion on the CentOS development list. This is only being evaluated for Scientific Linux version 7. {emphasis mine}

Security and other updates for the current Scientific Linux versions 5 and 6 will continue uninterrupted. We expect the process for SL 5 and 6 support to remain essentially the same, with the only substantive change being that source code will come from centos.org rather than redhat.com. We expect this change to be transparent to all users.

There will be many more details to fill in, and we'll try to keep everyone in the Scientific Linux community informed as we continue to explore the options the Red Hat / CentOS partnership presents.

Pat Riehecky posted that SL7 Alpha is ready to be tested (here)....snip...

QUOTE (patriehecky @ Jul 3 2014, 11:24 PM)

Fermilab's intention is to continue the development and support of Scientific Linux and refine its focus as an operating system for scientific computing. Today we are announcing an alpha release of Scientific Linux 7. We continue to develop a stable process for generating and distributing Scientific Linux, with the intent that Scientific Linux remains the same high quality operating system the community has come to expect.

...snip...

Which was explicitly only mentioning FermiLAB , not CERN.I have not watched CERN - SL news closely , so the O.P's quote is news to me --from : http://linux.web.cern.ch/linux/centos7/more complete :

QUOTE

What is CERN CentOS 7 (CC7) ?

CERN Community ENTerprise Operating System 7 is the upstream CentOS 7, built to integrate into the CERN computing environment but it is not a site-specific product: all CERN site customizations are optional and can be deactivated for external users.What happened to Scientific Linux CERN (SLC) ?As described at Next Linux version @ CERN the next major Linux release at CERN will be based on CentOS Linux.

Scientific Linux CERN 6 and Scientific Linux CERN 5 will remain as current production releases.When will CERN CentOS 7 be available ?Following Red Hat Enterprise Linux 7 release CentOS Core SIG released CentOS 7 on 7th of July 2014

A prerelease test CC7 version is available as of 17.07.2014 04.08.2014.

As for the future, it would be great if SL can make use of CentOS repositories when we need additional packages.

That is something you can configure yourself of courseI seriously doubt that SL will do that for you.

Makes sense. But now that SL7 is still in testing, changes can be made (or not be made) that increase or decrease the differences between SL and the others. Less differences makes it easier. E.g., consider the "yum-autoupdate" system.